:root{
  --blue:#4d97ff; --blue-d:#3373cc; --orange:#ffab19; --green:#59c36a; --red:#e4573d;
  --ink:#24344d; --ink-2:#5b6b82; --line:#e3e8f0; --bg:#f5f7fb; --card:#fff;
  --radius:14px; --shadow:0 2px 10px rgba(36,52,77,.08);
}
*{box-sizing:border-box}
/* 必须放在最前：.modal 等类选择器设了 display，会盖掉 HTML 的 hidden 属性，
   导致弹窗永远显示、挡住整个页面。此规则强制 hidden 生效。 */
[hidden]{display:none !important}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;
  background:var(--bg);color:var(--ink);font-size:15px;line-height:1.6}
a{color:var(--blue);text-decoration:none}
h1,h2,h3{margin:0 0 .4em}
button{font-family:inherit}
.wrap{max-width:960px;margin:0 auto;padding:24px 16px 60px}

/* ---------- 首页 ---------- */
body.home{background:linear-gradient(160deg,#eaf3ff 0%,#f7f9fc 60%)}
.hero{text-align:center;padding:36px 0 24px}
.logo{font-size:56px;line-height:1}
.hero h1{font-size:26px;margin:10px 0 6px}
.sub{color:var(--ink-2);margin:0}
.choose{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:20px}
.pick{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;box-shadow:var(--shadow);display:block;color:inherit}
a.pick:hover{border-color:var(--blue);transform:translateY(-2px);transition:.15s}
.pick-emoji{font-size:34px}
.pick h2{font-size:19px;margin:6px 0}
.pick p{color:var(--ink-2);margin:0 0 12px;font-size:14px}
.foot{text-align:center;color:var(--ink-2);font-size:13px;margin-top:24px}

/* ---------- 通用组件 ---------- */
.btn{border:0;border-radius:10px;padding:10px 18px;font-size:15px;cursor:pointer;background:#e9edf5;color:var(--ink)}
.btn:hover{filter:brightness(.96)}
.btn-primary{background:var(--blue);color:#fff}
.btn-orange{background:var(--orange);color:#fff}
.btn-ghost{background:transparent;border:1px solid var(--line);color:var(--ink-2)}
.btn:disabled{opacity:.55;cursor:not-allowed}
.btn-sm{padding:6px 12px;font-size:13px;border-radius:8px}
input[type=text],input[type=password],input[type=number],textarea,select{
  width:100%;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font-size:15px;
  font-family:inherit;color:var(--ink);background:#fff}
textarea{min-height:110px;resize:vertical}
input:focus,textarea:focus{outline:2px solid rgba(77,151,255,.35);border-color:var(--blue)}
label{display:block;font-weight:600;margin:14px 0 6px;font-size:14px}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.muted{color:var(--ink-2);font-size:13px}
.tag{display:inline-block;background:#eef4ff;color:var(--blue-d);border-radius:999px;padding:2px 10px;font-size:12px;font-weight:600}
.tag.done{background:#e7f7ec;color:#2f8a45}
.empty{text-align:center;color:var(--ink-2);padding:28px 10px}
.err{background:#fdeceb;color:#a8321d;border:1px solid #f7cfc8;border-radius:10px;padding:10px 12px;font-size:14px}
.ok{background:#e7f7ec;color:#2f8a45;border:1px solid #bfe6c8;border-radius:10px;padding:10px 12px;font-size:14px}

/* ---------- 顶栏 ---------- */
.topbar{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar .inner{max-width:960px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;gap:12px}
.topbar .title{font-weight:700;flex:1}
.topbar .who{color:var(--ink-2);font-size:13px}

/* ---------- 教师端 ---------- */
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:start}
.list{display:flex;flex-direction:column;gap:10px;margin-top:12px}
.item{border:1px solid var(--line);border-radius:12px;padding:12px 14px;background:#fff;cursor:pointer}
.item:hover{border-color:var(--blue)}
.item.active{border-color:var(--blue);box-shadow:0 0 0 3px rgba(77,151,255,.12)}
.item h4{margin:0 0 2px;font-size:15px}
.thumbs{display:flex;gap:6px;flex-wrap:wrap;margin-top:8px}
.thumbs img{width:56px;height:42px;object-fit:cover;border-radius:6px;border:1px solid var(--line)}
.codebox{display:flex;align-items:center;gap:8px;margin-top:12px;background:#f7f9fd;border:1px dashed var(--line);
  border-radius:10px;padding:10px 12px}
.codebox .code{font-size:22px;font-weight:800;letter-spacing:3px;color:var(--blue-d)}

/* ---------- 提交表格 ---------- */
table.sub{width:100%;border-collapse:collapse;margin-top:12px;font-size:14px}
table.sub th,table.sub td{border-bottom:1px solid var(--line);padding:10px 8px;text-align:left;vertical-align:top}
table.sub th{color:var(--ink-2);font-weight:600;font-size:13px}
.stars{display:flex;gap:2px}
.star{font-size:18px;cursor:pointer;color:#d7dde8;background:none;border:0;padding:0;line-height:1}
.star.on{color:#ffb400}

/* ---------- 学员端 ---------- */
.task{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.task h2{font-size:20px}
.task .desc{white-space:pre-wrap;margin:8px 0}
.shots{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0}
.shots img{max-width:260px;max-height:200px;border-radius:10px;border:1px solid var(--line);cursor:zoom-in}
.steps{counter-reset:s;display:flex;flex-direction:column;gap:8px;margin:12px 0}
.steps li{list-style:none;background:#f7f9fd;border-radius:10px;padding:10px 12px;position:relative;padding-left:38px}
.steps li:before{counter-increment:s;content:counter(s);position:absolute;left:12px;top:10px;width:18px;height:18px;
  border-radius:50%;background:var(--blue);color:#fff;font-size:12px;display:grid;place-items:center}
.drop{border:2px dashed #c9d4e6;border-radius:14px;padding:24px;text-align:center;background:#fbfcff;cursor:pointer}
.drop.over{border-color:var(--blue);background:#eef4ff}
.drop .big{font-size:15px;font-weight:600}
.fileok{display:flex;align-items:center;gap:8px;background:#e7f7ec;border:1px solid #bfe6c8;border-radius:10px;padding:10px 12px}
#editorWrap{position:relative;min-height:220px;background:#fff}
#editorWrap iframe{display:block;width:100%;height:760px;border:0}

/* ---------- 学员端全屏创作模式 ---------- */
/* 工具条固定在顶部一行，编辑器占满其余全部屏幕，避免积木区/角色库被挤窄 */
.workbar{position:fixed;top:0;left:0;right:0;height:52px;z-index:40;display:flex;align-items:center;
  gap:8px;padding:0 12px;background:#855cd6;color:#fff;box-shadow:0 2px 8px rgba(30,20,60,.25);
  overflow-x:auto;overflow-y:hidden;white-space:nowrap}
.workbar .wb-title{font-size:15px;max-width:220px;overflow:hidden;text-overflow:ellipsis}
.workbar .wb-meta{color:rgba(255,255,255,.85);font-size:13px;text-decoration:none}
.workbar .wb-space{flex:1}
.workbar input[type=text]{width:150px;padding:6px 10px;font-size:14px;border:0;border-radius:8px}
.workbar .btn{flex:none}
body.working{overflow:hidden}
body.working .topbar{display:none}
body.working #editorWrap{position:fixed;top:52px;left:0;right:0;bottom:0;z-index:30}
body.working #editorWrap iframe{width:100%;height:100%;border:0}
#editorLoading{position:absolute;inset:0;display:grid;place-items:center;background:#fff;z-index:2}
.done-float{position:fixed;top:60px;left:50%;transform:translateX(-50%);z-index:60;max-width:86%}
@media (max-width:760px){
  .workbar{height:92px;flex-wrap:wrap;overflow:visible;white-space:normal}
  body.working #editorWrap{top:92px}
}
.submitbar{background:#fff8ec;border:1px solid #ffe0b2}
#playFrame{display:block;width:100%;height:620px;border:1px solid var(--line);border-radius:10px;background:#fff}

/* ---------- 作品预览 ---------- */
.modal{position:fixed;inset:0;background:rgba(20,28,42,.6);display:flex;align-items:center;justify-content:center;z-index:50;padding:16px}
.modal .panel{background:#fff;border-radius:16px;max-width:900px;width:100%;max-height:92vh;overflow:auto;padding:18px}
.modal .panel h3{margin:0 0 10px}
.stagewrap{background:#2b3a52;border-radius:12px;padding:10px;display:grid;place-items:center}
.stagewrap canvas{width:480px;height:360px;max-width:100%;border-radius:8px;background:#fff}
.closebtn{float:right}

@media (max-width:760px){
  .choose,.grid2{grid-template-columns:1fr}
  #editorWrap iframe{height:560px}
}